Model: 2570

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1 in free-field, condenser microphone, typical sensitivity = 51 mV/Pa. 200 VDC polarization

Externally polarized 1 inch free field microphone, 48 mV/Pa, 20 kHz.

  • Nominal Microphone Diameter: 1"
  • Frequency Response Characteristic: Free-Field
  • Frequency Range: (±1dB) 4 to 16000 Hz (4 to 16000 Hz)
  • Dynamic Range: >146 dB re 20 µPa

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Nominal Microphone Diameter1"1" 
Frequency Response Characteristic (at 0° incidence)Free-FieldFree-Field 
Open Circuit Sensitivity (±1.5 dB)-26.4 dB re 1 V/Pa-26.4 dB re 1 V/Pa[2] 
Open Circuit Sensitivity48 mV/Pa48 mV/Pa[2] 
Frequency Range (±1 dB)4 to 16000 Hz4 to 16000 Hz 
Frequency Range (±2 dB)2.6 to 20000 Hz2.6 to 20000 Hz 
Lower Limiting Frequency (-3 dB)1 to 2 Hz1 to 2 Hz 
Resonant Frequency (90° Phase Shift)11000 Hz11000 Hz[1] 
Inherent Noise<10 dB(A) re 20 µPa<10 dB(A) re 20 µPa 
Dynamic Range (3% Distortion Limit)>146 dB re 20 µPa>146 dB re 20 µPa 
Standards Designation (IEC 61094-4)WS1FWS1F 
Temperature Range (Operating)-40 to 302 °F-40 to 150 °C 
Temperature Coefficient of Sensitivity (+14 to +122°F (-10 to +50°C))0.004 dB/°F0.01 dB/°C[1] 
Static Pressure Coefficient-0.0136 dB/kPa-0.0136 dB/kPa[1] 
Humidity Coefficient of Sensitivity (0 to 95%, non-condensing)±0.001 dB/%RH±0.001 dB/%RH 
Influence of Axial Vibration (0.1g (1 m/s²))68 dB re 20 µPa68 dB re 20 µPa[1] 
Capacitance (Polarized)48 pF48 pF[1] 
Polarization Voltage200 V200 V 
Housing MaterialStainless AlloyStainless Alloy 
Mounting Thread (Preamplifier)0.9098-60 UNS23.11mm-60 UNS 
Mounting Thread (Grid)0.9098-60 UNS23.11mm-60 UNS 
Size - Diameter (with grid)0.936 in23.77 mm 
Size - Diameter (without grid)0.936 in23.77 mm 
Size - Height (with grid)0.748 in19 mm 
Size - Height (without grid)0.668 in17 mm 
Weight1.08 oz30.6 gm[1] 

All specifications are at room temperature unless otherwise specified.

Product Notes
[1] Typical.
[2] re 250 Hz
ACS-20Calibration of Precision Condensor Microphones(1)
Optional Versions:
No optional versions
Product Documents None Listed
Additional Downloads None Listed
Microphone - Safe Handling and Maintenance

Prepolarized vs. externally polarized microphones